Last year the Guardian published edited extracts from these letters. We are delighted to be publishing their exchange in full, alongside new essays from each thinker, and an introduction by Philosophie editor Michel Eltchaninoff, who arranged their dialogue. Comradely Greetings: The Prison Letters of Nadya and Slavoj is out now (with 40% discount and free shipping when you buy through our website).

2 January 2013

Dear Nadezhda,

I hope you have been able to organise your life in prison around small rituals that make it tolerable, and that you have time to read. Here are my thoughts on your predicament.

John Jay Chapman, an American political essayist, wrote this about radicals in 1900: "They are really always saying the same thing. They don't change; everybody else changes. They are accused of the most incompatible crimes, of egoism and a mania for power, indifference to the fate of their cause, fanaticism, triviality, lack of humour, buffoonery and irreverence. But they sound a certain note. Hence the great practical power of persistent radicals. To all appearance, nobody follows them, yet everyone believes them. They hold a tuning-fork and sound A, and everybody knows it really is A, though the time-honoured pitch is G flat." Isn't this a good description of the effect of Pussy Riot performances? In spite of all accusations, you sound a certain note. It may appear that people do not follow you, but secretly, they believe you, they know you are telling the truth, or, even more, you are standing for truth.

But what is this truth? Why are the reactions to Pussy Riot performances so violent, not only in Russia? All hearts were beating for you as long as you were perceived as just another version of the liberal-democratic protest against the authoritarian state. The moment it became clear that you rejected global capitalism, reporting on Pussy Riot became much more ambiguous. What is so disturbing about Pussy Riot to the liberal gaze is that you make visible the hidden continuity between Stalinism and contemporary global capitalism.

[Žižek then explores what he sees as a global trend towards limiting democracy.] Since the 2008 crisis, this distrust of democracy, once limited to third-world or post-Communist developing economies, is gaining ground in western countries. But what if this distrust is justified? What if only experts can save us?

But the crisis provided proof that it is these experts who don't know what they are doing, rather than the people. In western Europe, we are seeing that the ruling elite know less and less how to rule. Look at how Europe is dealing with Greece.

No wonder, then, that Pussy Riot make us all uneasy – you know very well what you don't know, and you don't pretend to have any quick or easy answers, but you are telling us that those in power don't know either. Your message is that in Europe today the blind are leading the blind. This is why it is so important that you persist. In the same way that Hegel, after seeing Napoleon riding through Jena, wrote that it was as if he saw the World Spirit riding on a horse, you are nothing less than the critical awareness of us all, sitting in prison.

Comradely greetings, Slavoj

23 February 2013

Dear Slavoj,

Once, in the autumn of 2012, when I was still in the pre-trial prison in Moscow with other Pussy Riot activists, I visited you. In a dream, of course.

I see your argument about horses, the World Spirit, and about tomfoolery and disrespect, as well as why and how all these elements are so connected to each other.

Pussy Riot did turn out be a part of this force, the purpose of which is criticism, creativity and co-creation, experimentation and constantly provocative events. Borrowing Nietzsche's definition, we are the children of Dionysus, sailing in a barrel and not recognising any authority.

We are a part of this force that has no final answers or absolute truths, for our mission is to question. There are architects of apollonian statics and there are (punk) singers of dynamics and transformation. One is not better than the other. But it is only together that we can ensure the world functions in the way Heraclitus defined it: "This world has been and will eternally be living on the rhythm of fire, inflaming according to the measure, and dying away according to the measure. This is the functioning of the eternal world breath."

We are the rebels asking for the storm, and believing that truth is only to be found in an endless search. If the "World Spirit" touches you, do not expect that it will be painless.

Laurie Anderson sang: "Only an expert can deal with the problem." It would have been nice if Laurie and I could cut these experts down to size and take care of our own problems. Because expert status by no means grants access to the kingdom of absolute truth.

Two years of prison for Pussy Riot is our tribute to a destiny that gave us sharp ears, allowing us to sound the note A when everyone else is used to hearing G flat.

At the right moment, there will always come a miracle in the lives of those who childishly believe in the triumph of truth over lies, of mutual assistance, of those who live according to the economics of the gift.